<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		.site-r a {
			color: red;
		}
		.nav a {
			color: skyblue;
		}
		.nav, .sitenav {
			/*font-size: 14px;
			font-family: "microsoft yahei";*/
			font: 14px "microsoft yahei";
		}
		.nav > ul > li > a {
			color: green;
		}
	</style>
</head>
<body>
	<div class="nav">
		<ul>
			<li><a href="#">公司首页</a></li>
			<li><a href="#">公司简介</a></li>
			<li><a href="#">公司产品</a></li>
			<li>
				<a href="#">联系我们</a>
				<ul>
					<li><a href="#">公司邮箱</a></li>
					<li><a href="#">公司电话</a></li>
				</ul>
			</li>
		</ul>
	</div>
	<div class="sitenav">
		<div class="site-1">左侧侧导航栏</div>
		<div class="site-r"><a href="#">登录</a></div>
	</div>
</body>
</html>